Insecticide



Patented on; 19, 1931 UNITED STATES,

PATENT OFFICE INSECTICIDE Donald L. Vivian and Herbert L. J. Heller, Washington, D. (humiliated-t the free use of the. Public in the territory of the United States of America No Drawing. Application June 27, 1936, Serial no. 87,748

3 Claims. 401. 167-30) (Granted, under the act of March 3, 1883, as amended April 30,1928; :10 o. G. 157) This application is made under the act of March 3, 1883, as amended by the act of April 30,

1928, and the invention herein described, if patupon the granting of a patent to us.

This invention relates to improvements in materials for destroying or checking the growth or multiplication of living organisms, whether plant 15 or animal, which are economically injurious to man.

An object of the invention is to provide materials suitable for use as insecticides.

Another object of the invention is to provide a :0 material for dusting or spraying delicate vegetation such as bean plants, peach trees, and

plants grownunder glass, which will not cause injury'to foliage.

Another object of the invention isto provide a 25 material which is relatively non-toxic to man and domestic animals when taken by mouth, and

which can be used in place of lead arsenate and other arsenicals for destroying insects withoutleaving harmful residues on fruits and vegetables. 80 We have found that substances belonging to a certain class of organic compounds have a specific toxic effect upon harmful insects, and our invention consists in the application of said-substances to the destruction of insect pests. The novel insecticides found by us belong to the class of organic compounds which contain in their molecules, according to accepted formulation, two homocyclic nuclei joined by any azo. linkage, that is, by the -N=N-- group, and which contain, inaddition, one or more amino groups, together with one or more alkyl or aryl groups.

Typical representatives of this class of compounds are:.

4-phenylazo-o-toluidina 1-m-toiylazo-2-naphthyiamine (EH1 I 1 all -2- hthl inc '0 OYBZQ nap CH HIN GHQ p-(Z-naphthylazo)-dimethylanilina i-(o-toiyla ao)-m-phenylene-diamine 7 CH: :N

. Variations in the methods of preparation can be 40 readily made by one skilled in the art, but these methods do not affect the novel features claimed. Fhr specific examples of the toxicity of these compounds it may be stated that when l-(o-tolyiazo)-2-naphthylamine was dissolved in acetone and the resulting solution poured into water there resulted a mortality of culicine mosquito larvae within '16 hours when the concentration of the sac compound was one part to 25,000 parts of water.

When 4-(o-to1ylazo)-o-toluidine was dissolved in acetone and the resulting solution poured into water there resulted a 50% mortality of culicine mosquito larvae within 16 hours when the concentration of the azo compound was one part to 100,000 parts of water. i

The above examples are not to be construed as limiting either the method of application of these novel insecticides or the kinds of insects to which they may be applied.

These aryl aminoazo compounds may be applied in a, manner similar to that in which insecticides in general are used, that is, as dusts, or in the form of solutions or suspensions in various media, such as water, kerosene, etc., and either with or without the use of spreaders, wetting agents, or sticking agents.

Having thus described our invention we claim:

1.' An insecticide comprising a compound selected'from the group consisting of 4-phenylazo-o-toluidine 4-phenylazo -m-toluidine p- (o-tolylazo) -aniline p- (m-tolylazo) -aniline p- (p-tolylazo) -aniline 5 1- (o-tolylazo) -2-naphthyla,mine 4- (o-tolylazo) l-naphthylamine 1- (m-tolylazo) -2-naphthylamine h 1- (p-tolyiazo) -2-naphthylamine 4- (m-toiylazo) -1-naphthylamine 4-(p-toly1azo) -1-naphthylamine 4- (o-tolylazo) -o-toluidine. 1

2. An insecticide containing as its essential 3. An insecticidecontaining as its essential active ingredient 4- (o-tolylazo) -o-toluidine.

DONALD L. VIVIAN. I HERBERT L. J. HALLER. 

